The history of submarine warfare mainly covers the North Atlantic in both World Wars and the Cold War. However for those who are interested do a bit of searching on submarine warfare in the Pacific during WW2 and you will discover the significant role the submarine base at Fremantle played in strangling Japanese maritime traffic. Essentially the Allies did to the Japanese what the Germans tried to do to England. I have no doubt that somewhere behind these plans for a nuclear powered sub, which is a very significant shift from Australia's policy on how their subs are to be powered, is the history of the last maritime conflict in the Indo Pacific. I also wonder if they have received information about Chinese detection capability of conventionally powered subs.